Perhaps you should try some spelling variations:
tren thuoc » trien thuoc, tren thuc, trung thuoc
quan doanh » quan doan, nhuan doanh, quan hoang
doanh khoa » toan khoa
khac thong » khac thuong, khac trong, khap thong
sach tren » sach tien, sach tranh
thuoc cac » thuoc cuc, thuoc cao, thuoc dac
khoan pho » khoan nhoi, khoan phai, khoan hoi
pho thong » he thong
khoa khac » khoa kham, khoanh khac, khoa hoc
sach tri » sach tai, sach truc, sach bai
tri quan » trinh quan, hai quan, mai quan
te sach » toc sach
tu sach » thu sach, su sach, tu cach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach tren thuoc cac khoan pho thong ) or ( tu sach tri quan doanh khoa khac thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tren thuoc cac khoan pho thong ) OR ( tu sach tri quan doanh khoa khac thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tren thuoc cac khoan pho thong ) or ( tu sach tri quan doanh khoa khac thong ))*.